JP2011258727A - Coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil component which can enhance the mounting strength onto a mounting substrate and can be manufactured easily.SOLUTION: A coil component comprises: a coil around which a conductor is wound; and an outer peripheral core member 1 covering an outer periphery of the coil. Further, a mounting surface is formed by two or more members including the outer peripheral core member 1. A first electrode or terminal is arranged on a bottom face of the outer peripheral core member 1 forming the mounting surface and a second electrode or terminal is arranged on a bottom face of the other member forming the mounting surface. A terminal end of the coil is connected to one of the first or second electrodes or terminals.

Description

  The present invention relates to a coil component used in various electric products, electronic devices and the like.

  The coil component is configured by winding a conductive wire around a core. When this coil component is mounted on a substrate or the like, for example, planar mounting in which the bottom surface side of the coil component is connected to the mounting substrate as a mounting surface is used.

  For example, in Patent Document 1, an electrode is formed on a flat surface outside a flange of a drum core around which a coil is wound, and is used as a mounting surface. In Patent Document 1, a lead wire guide groove is provided in an outer peripheral portion of a flange forming an attachment surface, and a plating electrode is formed from the attachment surface to the lead wire guide groove and its periphery. The lead wire of the coil is soldered to the plating electrode in the lead wire guide groove.

Moreover, in patent document 2, in the inductance element comprised by a drum core and a ring core, the terminal is provided ranging over a drum core and a ring core. This terminal is provided with a U-shaped mounting part on the inner peripheral surface, upper surface, and outer peripheral surface of the ring core, and provided from the outer peripheral edge of the ring core to the winding shaft facing surface of the lower end flange of the drum core in connection with this mounting part. And the mounted part.
In Patent Document 2, it is said that by adopting such a configuration, it is possible to suppress the occurrence of cracking even when the ring core or the drum core is subjected to an impact.

Japanese Utility Model Publication No. 06-009103 Japanese Patent Laid-Open No. 2003-109823

  In the above-mentioned Patent Document 2, an attempt is made to improve impact resistance so that the drum core or the ring core alone is not broken. However, for example, a coil component such as an inductor used for in-vehicle use is required to have high vibration resistance, and it is necessary to increase the mounting strength between the coil component and the mounting substrate.

Moreover, in patent document 2, the lead wire of the coil is connected to the terminal assembled so as to straddle the drum core and the ring core. Therefore, the coil lead wire cannot be connected and fixed to the terminal until the coil is wound around the drum core and the terminal is assembled to the drum core and the ring core.
Accordingly, since the lead wire is not fixed anywhere until the terminal is assembled, the lead wire moves freely and interferes with assembling of other parts, so that workability is deteriorated. In addition, since it is necessary to take measures such as temporary fixing so that the coil is not unwound from the winding shaft until the coil lead wire is entangled with the terminal, the manufacturing process becomes complicated and the cost increases.

  In view of the above problems, an object of the present invention is to provide a coil component that can be easily manufactured while ensuring high mounting strength on a mounting substrate.

  In order to solve the above-described problems, a coil component according to the present invention includes a coil around which a conductive wire is wound and an outer peripheral core member that covers the outer periphery of the coil. Further, the mounting surface portion of the coil component is formed by the bottom surfaces of two or more members including the outer peripheral core member. The first electrode or terminal is provided on the bottom surface of the outer peripheral core member forming the mounting surface portion, and the second electrode or terminal is provided on the bottom surface of the other member forming the mounting surface portion. The terminal of the coil is connected to either the first electrode or terminal and the second electrode or terminal.

According to the coil component of the present invention, the mounting surface portion is formed by the bottom surfaces of two or more members including the outer peripheral core member, and the electrode or the terminal is provided on each member forming the mounting surface portion. Therefore, two or more members including the outer peripheral core member can be directly fixed to the mounting substrate by bonding the electrodes or terminals to the land of the mounting substrate.
In addition, since separate electrodes or terminals are provided for each member forming the mounting surface portion, it is not necessary to bother attaching the terminals across the two members after assembling the two members as in the prior art. Therefore, the terminal portion of the coil can be connected to the electrode or the terminal before assembling the two members.

  When the coil member is configured to include a base member on which a drum core member having a winding shaft portion around which the coil is wound is placed and an outer peripheral core member that covers the outer periphery of the coil wound around the drum core member. Preferably, the mounting surface portion is formed by the bottom surface of the outer peripheral core member and the bottom surface of the base member, and electrodes or terminals are provided on the respective bottom surfaces.

Accordingly, the electrodes or terminals provided on the bottom surface of the outer peripheral core member and the bottom surface of the base member can be joined to the lands of the mounting substrate, respectively.
In addition, since the drum core member is fixed to the base member and the mounting substrate independently of the outer peripheral core member, the terminal portion of the coil can be connected to the electrode or the terminal before the outer peripheral core member is assembled.

When the base member is not required, the mounting surface portion is constituted by the bottom surface of the drum core member and the bottom surface of the outer core member, and electrodes or terminals are provided on both the bottom surface of the drum core member and the bottom surface of the outer core member. Also good.
As a result, the electrodes or terminals provided on both the bottom surface of the drum core member and the bottom surface of the outer peripheral core member can be joined to the land of the mounting substrate. Therefore, both the drum core member and the outer peripheral core member can be directly fixed to the mounting substrate.

According to the present invention, two or more members constituting the coil component can be directly fixed to the mounting substrate. For this reason, high mounting strength can be ensured.
Moreover, since the terminal part of a coil can be connected to an electrode or a terminal before and after assembling two members, it can suppress that a coil terminal part moves freely, being unstable. Therefore, workability can be improved and manufacturing can be performed more easily and at low cost.

It is a schematic perspective view which shows the structure of the coil component which concerns on the 1st Embodiment of this invention. It is a perspective view of the coil component which concerns on the 1st Embodiment of this invention. It is the perspective view which looked at the outer periphery core member of the coil components which concern on the 1st Embodiment of this invention from the downward direction. It is a perspective view which shows the structure of the coil component which concerns on the 2nd Embodiment of this invention. It is a bottom view of the coil component which concerns on the 2nd Embodiment of this invention.

  Hereinafter, although the coil component which concerns on embodiment of this invention is demonstrated based on FIGS. 1-5, this invention is not limited to the following examples.

1. 1st Embodiment The structure of the coil component by 1st Embodiment is demonstrated using FIGS. 1-3.
FIG. 1 is a perspective view of the coil component 100 according to the present embodiment as viewed from below. FIG. 2 is a side view of the coil component 100 as viewed from the surface 1a side, and FIG. 3 is a perspective view of the outer peripheral core 1 constituting the coil component 100 as viewed from below.

  The coil component 100 according to the present embodiment includes a drum core member (not shown), a coil (not shown) wound around a winding shaft portion of the drum core member, a base member 2 on which the drum core member is placed, a coil The outer periphery core member 1 which covers the outer periphery is provided.

The drum core member and the outer core member 1 are made of, for example, a sintered magnetic material, and for example, Mn—Zn or Ni—Zn ferrite, sendust, permalloy, or the like may be used.
In addition, the drum core member includes, for example, a winding shaft portion that winds a coil, and flanges provided at the upper and lower ends of the winding shaft portion, and the lower end surface thereof is fixed to the upper surface of the base member 2. This fixing method is not particularly limited here, and may be fixed by, for example, an adhesive, or may be fixed by fitting the lower end of the drum core member to the upper surface of the base member. Further, electrodes and terminals may be provided on the lower end of the drum core member and the upper surface of the base member 2, and the electrodes may be fixed together by soldering.

  The base member 2 is made of a plastic material such as resin, and two terminals 3 are disposed on the bottom surface thereof. As shown in FIG. 1, the terminal 3 is embedded in the base member 2 by, for example, insert molding a hoop-shaped terminal, and protrudes from the side surface of the base member 2. Thus, the binding terminal 6 is formed. As shown in FIG. 2, a terminal portion 9 of a coil wound around a drum core is bound to the binding terminal 6, whereby the coil and the terminal 3 are connected.

  If the coil end is connected to a planar electrode or terminal with solder or the like as in the past, if the coil lead wire diameter is thin, the terminal will be broken and the connection will be difficult. It is. However, in this embodiment, since the binding terminal 6 protruding from the side surface of the base member 2 is provided, for example, even if the terminal 3 and the protruding terminal 31 fluctuate, the coil having a small diameter can be easily disconnected. Can be connected to. Moreover, when it is desired to increase the inductance value, the number of turns can be increased by using a coil with a small diameter even if the coil after winding has the same weight and size.

  On the other hand, a notch 32 is provided on the side surface of the base member 2 where the binding terminal 6 is not formed. At both ends of the notch 32, the protruding terminal 31 is formed by the terminal 3 protruding from the side surface of the base member 2. The user can provide a land on the mounting substrate, and can electrically connect the land 3 and the protruding terminal 31 exposed on the bottom surface of the base member.

  As shown in FIG. 3, for example, a cylindrical through hole 8 is provided inside the outer core member 1, and a drum core member (not shown) is disposed in the through hole 8. Thereby, the outer periphery of the coil wound around the winding shaft portion of the drum core member is covered with the outer core member 1.

Moreover, the leg part 5 is provided in the bottom part of a pair of side surface which the outer periphery core member 1 opposes, respectively, and the electrode 4 by plating etc. is formed in the bottom face of the leg part 5, for example. The leg 5 is inserted into the notch 32 of the base member 2. Then, the bottom surface 7 of the outer peripheral core member 1 and the upper surface of the base member 2 are bonded and fixed with an adhesive.
In addition, the side surface of the leg part 5 and the side surface of the notch part 32 of the base member 2 do not need to be fixed with the adhesive agent. Moreover, although the leg part 5 and the notch part 32 may be fitted, the clearance gap may be left and the allowance may be provided as shown in FIG.

Moreover, the window part 10 of the shape by which the lower end was open | released is provided below the side surface of the outer periphery core member 1 in which the leg part 5 is not provided. The terminal portion of the coil disposed in the through hole 8 can be entangled with the binding terminal 6 by being drawn out of the outer core member 1 through the window portion 10.
As shown in FIG. 1 and FIG. 2, the side surface of the outer peripheral core member 1 on the side where the binding terminal 6 is disposed protrudes from the base member 2. In particular, it is preferable that the side surface of the outer peripheral core member 1 is protruded from the binding terminal 6, thereby suppressing the binding terminal 6 from being damaged by being in contact with an external object.

As described above, in the coil component 100 according to the present embodiment, two members of the outer peripheral core member 1 and the base member 2 are arranged on the bottom surface. That is, the surface portion on the mounting side is constituted by the bottom surface of the leg portion 5 of the outer peripheral core member 1 and the bottom surface of the base member 2.
Independent electrodes 4 and terminals 3 are formed on the bottom surface of the leg 5 of the outer peripheral core member 1 and the bottom surface of the base member 2, respectively.

  Therefore, when the coil component 100 is mounted on the mounting board, the terminals 3 and the electrodes 4 can be joined to the lands provided on the mounting board by solder or the like. As a result, both the outer peripheral core member 1 and the base member 2 can be directly fixed to the mounting substrate, and the mounting strength can be greatly increased as compared with the case where only one member is fixed.

In addition, the outer peripheral core member 1 and the base member 2 are not only fixed to the bottom surface 7 of the outer peripheral core member 1 with an adhesive, but the leg portion 5 of the outer peripheral core member 1 is placed in the notch 32 of the base member 2. Has been inserted. For this reason, the assembly strength between the outer peripheral core member 1 and the base member 2 can be increased.
For example, in the coil component, the outer peripheral core member may occupy most of the total weight. Therefore, for example, it is necessary to increase the strength so that the coil component does not come off from the base member even with respect to vibration in a direction perpendicular to the side surface of the outer peripheral core member. In the present embodiment, as described above, the legs 5 of the outer core member 1 are inserted into the notches 32 of the base member 2 so that the force is applied in the direction perpendicular to the side surface of the outer core member 1. High durability can be imparted.

  In the above-mentioned Patent Document 2, since the terminal is attached across the drum core and the ring core, it is necessary to attach the terminal after the drum core and the ring core are assembled. Therefore, as a matter of course, the lead wire of the coil cannot be connected and fixed to the terminal unless the terminal is attached.

Further, in Patent Document 2, the side surface of the upper end flange of the drum core and the side surface of the ring core are fixed with an adhesive. When the adhesive dries, for example, shrinkage stress may occur, and the ring core may slightly shift from the drum core by such force before and after drying.
Therefore, if the coil lead wire is connected to the terminal assembled to the ring core before the adhesive dries, the lead wire may be pulled when the adhesive is dried, and the lead wire may be cut. Even if the lead wire is not cut, it is not preferable from the viewpoint of durability that such a force is continuously applied to the lead wire.

  On the other hand, in the present embodiment, the terminal 3 (binding terminal 6) and the electrode 4 are disposed independently on the outer core member 1 and the base core member 2, respectively. For this reason, the terminal 3 and the electrode 4 can be provided in advance on the outer peripheral core member 1 and the base member 2. Therefore, in the manufacturing process, before assembling the outer peripheral core member 1 to the base member 2, it is possible to independently connect and fix the terminal portion of the coil to the terminal 3 (binding terminal 6).

Moreover, in this Embodiment, the drum core member and the outer periphery core member 1 are each being independently fixed to the base member, without contacting directly.
And the terminal part of a coil is derived | led-out outside the outer periphery core member 1 through the window part 10 provided in the side surface of the outer periphery core member 1, and is connected to the binding terminal 6. FIG.
In particular, since the window portion 10 has an outer shape with an open lower end, the terminal portion of the coil can be connected to the binding terminal 6 without contacting the outer core member 1. The binding terminal 6 protrudes from the side surface of the base member 2 and is arranged independently of the outer peripheral core member 1.

  Thus, the terminal part of the coil and the binding terminal 6 are not in contact with the outer peripheral core member 1 and are arranged independently. For this reason, for example, even if the adhesive applied between the bottom surface 7 of the outer core member 1 and the base member 2 dries, shrinkage stress or the like occurs and the position of the outer core member 1 shifts, Thus, there is no influence such as the end 9 of the coil being pulled. Therefore, a high quality coil component can be provided.

  Further, as described above, since the coil terminal portion is not subjected to stress when the adhesive dries, the coil terminal portion is first bound to the terminal 6 and then the outer peripheral core member 1 is bonded and fixed to the base member 2. be able to.

As described above, in the coil component 100 of the present embodiment, the coil terminal portion 9 can be connected and fixed to the terminal 6 before the outer peripheral core member 1 is assembled. Therefore, the state where the unfixed coil terminal portion is exposed to the outside of the outer peripheral core member 1 while being unstable can be avoided, so that workability can be improved.
In addition, it is not necessary to take measures to prevent the coil wound around the winding shaft portion from unwinding until the terminal portion of the coil is connected to the electrode or the terminal, so that the cost can be reduced. .

  In addition, it is preferable to provide the land which joins the terminal 3 and the land which joins the electrode 4 together in the mounting substrate, respectively.

  As shown in FIG. 2, the terminal 3 and the electrode 4 are formed so as to protrude from the bottom surface of the base member 2. This is preferable because it can be reliably brought into contact with and bonded to the land of the mounting substrate.

  The locations and shapes of the terminals 3 and the electrodes 4 are not limited to the locations and shapes shown in FIG.

2. Second Embodiment In the above-described embodiment, the outer core member 1 and the base member 2 are provided with electrodes or terminals, respectively, so that both members are directly fixed to the mounting substrate. The number and shape of the members constituting the coil component are variously changed depending on the application, and can take various forms. Even in such a case, mounting strength can be increased by providing electrodes and terminals on two or more members constituting the coil component and directly fixing them to the mounting substrate.
Here, the case where a coil component is comprised with the coil, the drum core member, and the outer periphery core member is illustrated.

FIG. 4 is a perspective view showing a schematic configuration of the coil component 200 according to the second embodiment. FIG. 5 is a bottom view of the coil component 200 as viewed from below.
The coil component 200 according to the present embodiment includes a coil 40, a drum core member 20 having a core for winding the coil 40, and an outer core member 11 that covers the outer periphery of the coil 40 wound around the drum core member 20. Is provided.

  The drum core member 20 and the outer peripheral core member 11 are made of, for example, a sintered magnetic material, and for example, Mn—Zn-based or Ni—Zn-based ferrite, sendust, permalloy, or the like can be used.

  The drum core member 20 is provided with an upper end flange 21 and a lower end flange 22 on the upper end and the lower end of the winding shaft portion around which the coil 40 is wound. Here, the upper end ridge 21 and the lower end ridge 22 have different sizes, and the diameter of the lower end ridge 22 is smaller than the diameter of the upper end ridge 21.

  Here, the outer peripheral core member 11 has a substantially rectangular parallelepiped shape, and a pair of projecting portions 15 are provided at the position of the apex angle facing the upper surface 11a. A cylindrical through hole 18 is provided at the center of the upper surface 11a of the outer peripheral core member 11, and a drum core member 20 around which a coil is wound is inserted.

  The diameter of the through hole 18 is larger than the diameter of the lower end flange 22 of the drum core member 20 and smaller than the diameter of the upper end flange 21. Accordingly, when the lower surface of the upper end flange 21 and the upper surface 11a of the outer peripheral core member 11 come into contact with each other, it becomes a stopper and is fixed.

Further, as shown in FIG. 5, two first electrodes 14 are formed on the bottom surface 11 b of the outer core member 11 by, for example, plating. The two electrodes 14 are connected to terminal portions of coils wound around the winding shaft portion of the drum core member 20.
The terminal portion of the coil may be directly connected to the electrode 14 by solder or the like, or a protruding end that protrudes from the side surface of the outer core member 11 is provided on the electrode 14, and the terminal portion of the coil is entangled with this protruding end. Or may be joined by solder or the like.
Further, the electrode 14 may be further provided with a protruding end protruding from the side surface of the outer core member 11 and used as a terminal for a customer to use.

  On the other hand, two second electrodes 13 are also formed on the bottom surface of the lower end flange 22 of the drum core member 20. The electrode 13 is formed independently of the electrode 14 formed on the bottom surface 11b of the outer peripheral core member 11, and is electrically insulated from each other.

As described above, in the coil component 200 of the present embodiment, the bottom surface on the mounting surface side is constituted by the bottom surface 11 b of the outer peripheral core member 11 and the bottom surface of the lower end flange 22, that is, the bottom surface of the drum core member 20. .
Further, electrodes 14 for connecting the terminal portions of the coils are formed on the bottom surface 11 b of the outer peripheral core member 11, and electrodes 13 are formed on the bottom surface of the drum core member 20.

  Therefore, the coil component 200 according to the present embodiment can be mounted by joining both the electrode 13 and the electrode 14 to the land of the mounting substrate with solder or the like. Thereby, since both the outer periphery core member 11 and the drum core member 20 are directly fixed with respect to a mounting board | substrate, the mounting strength of the coil component 20 can be improved significantly. In particular, the outer peripheral core member 11 and the drum core member 20 are both fixed by soldering or the like. Therefore, in addition to fixing with an adhesive, it can be further fixed to the substrate with solder, so that a more stable high strength can be realized.

Also in the present embodiment, the electrode 13 and the electrode 14 are separately disposed on the outer peripheral core member 11 and the drum core member 20, respectively. Therefore, regardless of the process of assembling the outer peripheral core member 11 and the drum core member 20, the electrodes 13 and 14 can be provided in advance on these members.
Conventionally, the strength has been increased by attaching terminals across both the outer peripheral core member and the drum core member. For this reason, the terminal must be attached after the outer peripheral core member and the drum core member are assembled, and the terminal portion of the coil cannot be connected and fixed unless the terminal is further attached. For this reason, the terminal part of the coil remained unstable, and workability was deteriorated.

  On the other hand, in this Embodiment, the electrodes 13 and 14 can be previously provided independently in the outer periphery core member 11 and the drum core member 20, respectively. For this reason, the process of attaching a terminal across both members is unnecessary, and the terminal portion of the coil can be connected and fixed to the electrode 14 used for conducting an electric signal at an early stage. For this reason, workability | operativity can be improved and it can manufacture easily.

  In addition, although demonstrated as an electrode, you may provide a terminal and you may connect the terminal part of a coil to the 2nd electrode 13 provided in the lower end collar 22 of the drum core member of the bottom face 11b of the coil component 200 further.

  In the first and second embodiments of the present invention, the drum core member and the outer peripheral core member have been described. However, the core may have any shape, for example, a pot core and a T made up of a single ridge. A combination with a letter-shaped core, or a combination of an L-shaped core and a drum core as viewed from the upper surface covering a part of the coil instead of covering the entire outer periphery of the coil may be used.

  The embodiments of the coil component according to the present invention have been described above. It goes without saying that the present invention includes various conceivable modes without departing from the above-described embodiment and without departing from the gist of the present invention described in the claims.

1, 11 ... outer peripheral core member, 2 ... base member, 3 ... terminal, 4, 13, 14 ... electrode, 5 ... leg part, 6 ... binding terminal, 7 ..Bottom surface, 8, 18 ... through hole, 9 ... coil end portion, 10 ... window portion, 11a ... upper surface, 11b ... bottom surface, 15 ... projection, 20, ... -Drum core member, 21 ... upper end flange, 22 ... lower end flange, 31 ... protruding terminal, 32 ... notch, 40 ... coil

Claims (3)

A coil wound with a conducting wire;
An outer peripheral core member covering the outer periphery of the coil;
A mounting surface portion is formed by two or more members including the outer peripheral core member, and a first electrode or a terminal is provided on a bottom surface of the outer peripheral core member forming the mounting surface portion, thereby forming the mounting surface portion. A coil component, wherein a second electrode or terminal is provided on a bottom surface of the other member, and a terminal of the coil is connected to either the first or second electrode or terminal.   The coil component according to claim 1, wherein the other member is a base member on which a drum core member including a winding shaft portion around which the coil is wound is placed. The coil component according to claim 1, wherein the other member is a drum core member including a winding shaft portion around which the coil is wound.

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